9-13 July 2012
Africa/Johannesburg timezone
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Synthesis and characterization of a narrowband Ca5(PO4)3(OH):Gd3+, Pr3+ phosphor for medical applications

Presented by Ms. PUSELETSO MOKOENA on 10 Jul 2012 from 17:30 to 19:30
Type: Poster Presentation
Session: Poster Session
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Hydroxylapatite (Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(OH)) is a well-known bioceramic material for medical application because of its ability to form a chemical bond with bones. Due to the better osteoconductivity, synthetic hydroxylapatite is considered to be an ideal material as a bone substitute. In this study, we investigate the luminescent properties of (Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(OH)) co-doped with Gadolinium (Gd<sup>3+</sup>) and Praseodymium (Pr<sup>3+</sup>) synthesized using a wet chemistry method. The dried and calcined Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(OH):Gd<sup>3+</sup>, Pr<sup>3+</sup> phosphor was characterized using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Photoluminescence (PL) spectroscopy. The XRD patterns showed a single hexagonal (Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(OH)) phase. The diffraction peaks became narrower with an increase in the calcination temperature from 700 ⁰C to 900 ⁰C indicating an increase in the degree of crystallininty. Photoluminescence excitation measurements showed that the phosphor can be efficiently excited by 221 nm UV light. The PL emission spectrum consisted of two narrow bands with a major emission at 316 nm and a minor emission at 630 nm, which correspond to radiative transitions in Gd<sup>3+</sup> and Pr<sup>3+</sup> respectively. The Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(OH):Gd<sup>3+</sup>, Pr<sup>3+</sup> phosphor is evaluated for a possible application as a light source in phototherapy lamps.

Award

Yes

Level

M.Sc

Supervisor

OM Ntwaeaborwa ntwaeab@ufs.ac.za University of the Free state

Paper

Yes

Place

Location: IT Building
Room:


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